| 摘要 |
PURPOSE: A cable buried duct is provided to reduce working time by easily burying a cable without deeply digging ground and to reduce the thickness of the cable by eliminating steel which is included in the cable. CONSTITUTION: A cable buried duct is composed of a plurality of internal tubes(101,102), an external tube(201), and a metallic material(301). A plurality of internal tubes is formed to a longitudinal direction of a cable. A plurality of internal tubes respectively has a diameter of different sizes. The cable passes through the internal tube. The external tube protects a plurality of internal tubes in order to prevent the internal tube to be separated. The metallic material is included between a plurality of internal tubes. |
